Nut locking device



I Sept. 6, 1938. H KRlwAT 2,129,009

NUT LOCKING, DEVICE Filed June 11, 1936 Patented Sept. 6, 1938 h I 2,}

UNITED STATES PATENT or ies NUT LOCKING IDEWUJE Hans Kriwat,Brunmvich-Gliesrnarode,

\ Germany Application June 11, 1936, Serial No. 84.7% In GermanySeptember id, 1935 5 Claims. (@l. 151 255) Many types of nut locks areknown, not only Fig. 7 shows a modified construction of the such inwhich spring ring locking elements are flat pin in side elevation.arranged in an annular groove in the nut de- Fig. 8 is a plan view ofFig. 7. signed to prevent the nut from working loose Fig. 9 shows inside elevation the pin employed g in that the edge of the insertedspring presses in the form of construction illustrated in Figs. 3 5

against the screw thread and cuts into the same, and d. but also lockingmeans in which a collar provided Fig. 10 is a plan view of Fig. 9. withcrown slots is formed on the nut and a In both forms of construction thescrew threadnose on the locking part engages in one of several ed bolt ais provided with a reduced smooth exm axial grooves in the screw bolt.All known locktension 1) in which a plurality of axial slots l0 ingdevices are open to the objection that, as in (Fig. 2) or flutes c (Fig.4) are formed. The the case of spring ring locking devices, the screwnut d has a collar e with crown slots 2. There thread becomes damagedand distorted by the is an annular gap 1 between the bolt extension bedge of the inserted spring cutting therein, or and the collar e havinga uniform width on the 11s that the axial grooves cut into the screwthread entire height of the collar '2 (Fig. 1). lid of the bolt destroythe screw thread on the por- Th fi P (Figsi0 d o locking tion carryingthe nut. Moreover, the known pu p we e o p tough miliielmllocking meansare open to the objection that an The lat pin g has a h p- Slightlyabsolute conformity between the bolt, pin and elled nosei (Fig. 6). Itis bent into semi-circular nut is not attained so that the nut, on beingsubshape and the nose i is slipped into the slot 0 2i) jected toabnormal shocks, may overcome the which is most easily accessible (Fig.2). The locking means and break o'fi or bend them. fiat pin s So t ck tt .fillS the p between These objections are overcome by the inveirthecoll a bolt (Fig. l). The ends 9' 0f the tion. With a view to attainingthis object the pin (Fi 2) are bent a engage over the collar g5 end ofthe screw bolt has a smooth extension e under the flange it, so that thepin is locked either with axial slots or grooves, whereas the aga st fng ou y bending back the p screw bolt has no grooves. The nut isprovided ends a the pin y can easily be removed from with a collar withcrown slots, an annular gap the annular groove I. As it is not damagedit can of uniform width being formed between the be repeatedly used.

m collar and the bolt extension of a depth equal to The fiat pin 5illustrated in Figs. 7 and 8 has 30.

the height of thecollar. A pin shapable by hand a hose i of triangularcross section. It has an eye is inserted in this gap and its noseengages in It at one end and a wire-like-extenslon m at the an axialslot or groove, said pin bearing tightly the other. The pin is of suchlength that, after it against the periphery of the bolt extension andhas been bent about the collar e, the extension m its ends are foldedover under the collar. The n be read d through the y and knotted bolt,pin and nut thus form a rigid and unyield- In the locking deviceillustrated in Figs. 3 and able connection, in which automatic looseningof 4 the pin illu at in Figs- 9 and 10 is used the nut cannot possiblyoccur even under strong w ch Co sts o 1- rigid member 0 With a 11086 1Lstresses. It is possible to lock the bolt and nut The body is clamped int annular p J bet 49 in any desired position. the bolt and collar sothat it bears snugly against 40 a Two embodiments of the invention areillus both and the nose 12. engages in the nearest. flute trated by wayof example in the accompanying c in the bolt extension I) (Fig. 4). Twoflexible drawing, in which: arms 1' extend from the rigid body 0 of thepin,

Fig. 1 shows the locking device in side elevaand these arms are clampedin one of the crown tion, partly in section with axial slots in theslots of the collar e, whereupon the two arms d6 reduced end of thebolt. are bent back about the collar in the opposite Fig. 2 is a topplan view of the device. direction so that the pin cannot drop out. Fig.3 shows in side elevation, partly in section I claim: a modifiedconstruction of the device with grooves 1. A nut locking devicecomprising in c mmin the reduced bo t dnation a screw threaded bolt, anon-threaded ex- 50 Fig. 4 is a p w Of 3- tension on said bolt having aplurality oilongi- 5 shows in side elevation a flat pin as emtudinalflutes distributed around its periphery, ployed in the constructionillustrated in Figs. 1 and of a diameter corresponding to that of theand 2. bolt at the base of the thread, a screw threaded Fi 6 i a P V w fF nut. a tubular" non-threaded extension on the t5 outer end of saidout, sold eiitensiozi having an i'ected flange on the outer end of seieinut exten sion having egertui'es registering with the siots therein, alocking element, adapted to he inserted in the space formed between theinner surface of saici nut extension anti the periphery of said boltextension and to been against e portion of the periphery of said boltextension, a nose formed on said locking element adapted to engage inone of the longitudinal flutes in said hoit extension, and flexible armsfumed on said locking element adapted to extend; through one of theiorigitmib nai slots in seici nut extension and to wrap erounoi theouter side of said out extension in opposite directions between said.flange and the outer end of said out.

2. A nut locking device as seeeiiied in claim 1 in which theiorigitmiinei flutes eee eireiigeci directly adjacent to one anothergiving the bolt extension a serrated cross-sectional shape.

3. A not locking device as specified in claim 1, in which the lockingelement is formed by a, flexi-- hie metal strip hevinge projectionintermediate its length forming the nose, the two ends 01 the stripforming the flexible arms.

A nut locking device as specified in claim 1, in which the lockingelement is formed by a flexilole metal strip having a projectionintermediate its length forming the nose, the two enrls of the strip,forming the flexible arms, one end of said; strip being narrowed and theother end having an aperture adapted to receive the narrowed enzi whenthe element is folded around the nut extension,

5. A out locking device as specified in claim 1, in which the lockingelement comprises a head, with e nose formed on one side and two armsprojecting from the opposite side.

1 HANS KRIWAT.

